#include <bits/stdc++.h>
using namespace std;
const int MAXN=1510;
int n, m, w, h;
int v[MAXN][MAXN], marc[MAXN][MAXN];
vector<int>b_line[MAXN], b_col[MAXN];
void dfs(int l, int c){
marc[l][c]=1;
if(l!=n and marc[l+1][c]==0){
int aux=*prev(lower_bound(b_line[l].begin(), b_line[l].end(), c)), aux2=*prev(upper_bound(b_line[l+1].begin(), b_line[l+1].end(), c));
int mn=max(aux, aux2);
aux=*lower_bound(b_line[l].begin(), b_line[l].end(), c), aux2=*lower_bound(b_line[l+1].begin(), b_line[l+1].end(), c);
int mx=min(aux, aux2);
if(mx-mn-1>=w){
dfs(l+1, c);
}
}
if(l!=1 and marc[l-1][c]==0){
int aux=*prev(lower_bound(b_line[l].begin(), b_line[l].end(), c)), aux2=*prev(upper_bound(b_line[l-1].begin(), b_line[l-1].end(), c));
int mn=max(aux, aux2);
aux=*lower_bound(b_line[l].begin(), b_line[l].end(), c), aux2=*lower_bound(b_line[l-1].begin(), b_line[l-1].end(), c);
int mx=min(aux, aux2);
if(mx-mn-1>=w){
dfs(l-1, c);
}
}
if(c!=m and marc[l][c+1]==0){
int aux=*prev(lower_bound(b_col[c].begin(), b_col[c].end(), l)), aux2=*prev(upper_bound(b_col[c+1].begin(), b_col[c+1].end(), l));
int mn=max(aux, aux2);
aux=*lower_bound(b_col[c].begin(), b_col[c].end(), l), aux2=*lower_bound(b_col[c+1].begin(), b_col[c+1].end(), l);
int mx=min(aux, aux2);
if(mx-mn-1>=h){
dfs(l, c+1);
}
}
if(c!=1 and marc[l][c-1]==0){
int aux=*prev(lower_bound(b_col[c].begin(), b_col[c].end(), l)), aux2=*prev(upper_bound(b_col[c-1].begin(), b_col[c-1].end(), l));
int mn=max(aux, aux2);
aux=*lower_bound(b_col[c].begin(), b_col[c].end(), l), aux2=*lower_bound(b_col[c-1].begin(), b_col[c-1].end(), l);
int mx=min(aux, aux2);
if(mx-mn-1>=h){
dfs(l, c-1);
}
}
}
int main(){
int ch, lh, cv, lv;
cin>>m>>n>>w>>h>>ch>>lh>>cv>>lv;
int fx, fy;
for(int k=1;k<=m;k++){
b_col[k].push_back(0);
}
for(int k=1;k<=n;k++){
b_line[k].push_back(0);
for(int i=1;i<=m;i++){
char c;
cin>>c;
if(c=='X'){
v[k][i]=1;
b_line[k].push_back(i);
b_col[i].push_back(k);
}else if(c=='*'){
fx=k, fy=i;
}
}
b_line[k].push_back(m+1);
}
for(int k=1;k<=m;k++){
b_col[k].push_back(n+1);
}
dfs(lh+1, cv+1);
if(marc[fx][fy]){
cout<<"YES";;
}else{
cout<<"NO";
}
}
